21732052915225 has 9 divisors (see below), whose sum is σ = 26947774517853. Its totient is φ = 17385623685120.

The previous prime is 21732052915193. The next prime is 21732052915231. The reversal of 21732052915225 is 52251925023712.

It is a happy number.

The square root of 21732052915225 is 4661765.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 1473375985929 + 20258676929296 = 1213827^2 + 4500964^2 .

It is not a de Polignac number, because 21732052915225 - 2⁵ = 21732052915193 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 22842649 + ... + 23775001.

Almost surely, 2^{21732052915225} is an apocalyptic number.

21732052915225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21732052915225 is the 4661765-th square number.

21732052915225 is the 2330883-rd centered octagonal number.

It is an amenable number.

21732052915225 is a deficient number, since it is larger than the sum of its proper divisors (5215721602628).

21732052915225 is an frugal number, since it uses more digits than its factorization.

21732052915225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1864716 (or 932358 counting only the distinct ones).

The product of its (nonzero) digits is 756000, while the sum is 46.

Adding to 21732052915225 its reverse (52251925023712), we get a palindrome (73983977938937).

The spelling of 21732052915225 in words is "twenty-one trillion, seven hundred thirty-two billion, fifty-two million, nine hundred fifteen thousand, two hundred twenty-five".